The Rockbros 87639-4 bicycle lock is a compact, versatile steel lock designed for everyday use. It features a four-digit code offering 10,000 combinations, allowing keyless use. The copper cable tube has a diameter of approximately 11.6 mm and remains flexible, facilitating adjustment to various parts and mounting points of the bicycle.

The lock's features include:

• Lock type: cable, combination
• Code: 4 digits
• Number of combinations: 10,000
• Cable length: approximately 30 cm
• Cable diameter: approximately 11.6 mm
• Dimensions: approximately 154 × 138 mm
• Weight: approximately 152 g
• Material: steel, PVC, zinc alloy, ABS
• Color: black

The main features of the Rockbros 87639-4 lock include:

• Four-digit lock: offers 10,000 combinations and requires no key.
• Flexible copper cable tube: facilitates adjusting the lock to the mounting point.
• Frame protection: the PVC coating limits direct contact of the cable with the paint.
• Resistance to rain and corrosion: the closed construction is suitable for everyday outdoor use.
• Compact design: weight of only 152 g makes it easy to carry the lock in a bike bag or backpack.

The lock features easily recognizable large numbers for setting the correct code. The flexible tube facilitates choosing the mounting point, as it can be threaded through the frame, wheel, or other bike parts and then secured to a stand or other fixed point. The PVC coating protects the paint and makes installation and removal of the lock easier.

The compact design of the lock allows storage in bike bags, backpacks, or other small spaces, ensuring it is always accessible during stops.